Update author information in setup.py
Remove unnecessary file in manifest.in
Tweak install instructions
Revise README

Another example and minor tweaks
Specify norecursedirs for pytest
Add functional tests
Limit input to one file

Previous behavior would allow multiple files as input and use only the
header from the first file to determine what columns to output, which
could lead to unexpected results if the header of the subsequent files
do not match. It doesn't make sense to have this added complexity
without any good use cases.
Modify test imports

Keep under wcut namespace
Use wcut namespace in bin/wcut
Correct typo in test name
Raise exception if delimiter not in match line
Bump version to 0.4.0